qemu

FORK: QEMU emulator
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copy-before-write.h (1622B)

      1 /*
      2  * copy-before-write filter driver
      3  *
      4  * The driver performs Copy-Before-Write (CBW) operation: it is injected above
      5  * some node, and before each write it copies _old_ data to the target node.
      6  *
      7  * Copyright (c) 2018-2021 Virtuozzo International GmbH.
      8  *
      9  * Author:
     10  *  Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com>
     11  *
     12  * This program is free software; you can redistribute it and/or modify
     13  * it under the terms of the GNU General Public License as published by
     14  * the Free Software Foundation; either version 2 of the License, or
     15  * (at your option) any later version.
     16  *
     17  * This program is distributed in the hope that it will be useful,
     18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     20  * GNU General Public License for more details.
     21  *
     22  * You should have received a copy of the GNU General Public License
     23  * along with this program. If not, see <http://www.gnu.org/licenses/>.
     24  */
     25 
     26 #ifndef COPY_BEFORE_WRITE_H
     27 #define COPY_BEFORE_WRITE_H
     28 
     29 #include "block/block_int.h"
     30 #include "block/block-copy.h"
     31 
     32 /*
     33  * Global state (GS) API. These functions run under the BQL.
     34  *
     35  * See include/block/block-global-state.h for more information about
     36  * the GS API.
     37  */
     38 
     39 BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
     40                                   BlockDriverState *target,
     41                                   const char *filter_node_name,
     42                                   BlockCopyState **bcs,
     43                                   Error **errp);
     44 void bdrv_cbw_drop(BlockDriverState *bs);
     45 
     46 #endif /* COPY_BEFORE_WRITE_H */